16 results about "Ferrofluid" patented technology

An electronically-controlled digital ferrofluidic device is disclosed which employs a network of individually addressable coils in conjunction with one or more movable permanent magnets, where each moveable permanent magnet delivers the designated fluid manipulation-based tasks. The underlying mechanism facilitating fluidic operations is realized by addressable electromagnetic actuation of miniaturized mobile magnets that exert localized magnetic body forces on droplets filled with magnetic nanoparticles. The reconfigurable, contactless, and non-interfering magnetic-field operation properties of the underlying actuation mechanism allow for the integration of passive and active components to implement advanced and diverse operations with high efficiency (e.g., droplet sorting, dispensing, generation, merging, mixing, filtering, and analysis).

A heat transfer device 10 comprising a body defining a fluid circuit containing a ferrofluid, passing in proximity to a first surface 112 and a second surface 114, transferring heat between the surfac

The utility model discloses a ferrofluid filling device which comprises a liquid storage tank and an anti-dripping assembly. The liquid storage tank comprises a conveying pump fixedly installed on one side of the liquid storage tank. According to the ferrofluid filling device, after the filling device on the outer side of the liquid storage tank completes filling of ferrofluid, the floating block and the indicating rod on one side in the filling device are lifted so as to indicate completion of filling operation, meanwhile, after filling of the ferrofluid is completed, the threaded rod in the fixing sleeve can be screwed, and the filling operation is completed. The plugging block is pressed in the liquid inlet cavity through the screw rod to plug the liquid inlet cavity, so that after the ferrofluid is filled by the filling device, the liquid inlet cavity at the bottom of the filling device is plugged through the plugging block, and the problems that the ferrofluid drips on a filling workpiece and is wasted due to the fact that the filling device is taken down and residual ferrofluid in the internal liquid inlet cavity flows out are solved; and the floating block and the indicating rod in the filler can also flexibly identify the filling and filling of the ferrofluid in various parts through the indication in the filling and filling of the ferrofluid.

The application relates to the technical field of sewage treatment, and discloses an energy-saving and environment-friendly multiple sewage treatment device and a use method, which comprise a processor and two baffles installed on the processor, the two baffles divide the interior of the processor into a mixing zone, a reaction zone and a sedimentation zone, a plurality of groups of reaction tubes are installed between the two baffles and are communicated with the mixing zone and the sedimentation zone at two ends. 3+ The moving catalyst enrichment zone formed by the ferromagnetic fluid driven by the traveling wave magnetic field, the pulse magnetic field and Fe 2+ / Fe 2+ circulation generates a large number of hydroxyl radicals, an auxiliary electric field supplements H2O2 and Fe in situ, and the three cooperate to continuously and efficiently generate ·OH, so that organic pollutants can be quickly mineralized, chemical oxygen demand can be significantly reduced, toxic and harmful organic matters can be degraded, and chroma can be eliminated.

The invention discloses a magnetic control underwater multiphase interface visible light permeability structure manufacturing and tuning method, relates to the technical field of underwater optical interface regulation and control, and solves the problems of irreversible interface morphology, limited dimming amplitude, poor underwater stability and the like in a traditional interface regulation and control system. The method specifically comprises the following steps: constructing a micro-column structure through femtosecond laser direct writing: processing the micro-column structure on a rigid substrate surface array by adopting a femtosecond laser direct writing technology; modifying the surface of the micro-column structure: performing super-hydrophobic treatment on the surface of the micro-column structure, and modifying the surface of the substrate to be super-hydrophobic; injecting ferrofluid: inversely immersing the modified micro-column structure substrate in water, and injecting oil base-ferrofluid into a micro-column structure area. According to the sandwich structure, reversible movement of the ferrofluid is achieved in the underwater environment, and the problem that a traditional liquid film or interface system is prone to collapse and unrecoverable is solved.

The flexible magnetic field focusing and shear wave noise reducing electromagnetic-acoustic detection probe based on ferromagnetic fluid and method thereof, the probe comprises a flexible coil, a ferromagnetic fluid device, a permanent magnet and a shell device. The flexible coil is located at the bottom of the probe and is used for exciting and receiving signals; the ferromagnetic fluid device is located above the coil and has the characteristics of high magnetic permeability, difficult propagation of shear waves, fluid flow and incompressibility, thereby playing the roles of focusing the surface magnetic field, reducing the shear wave noise in the permanent magnet and pressing the coil to adhere to the surface of the pipeline; the flexible coil and the ferromagnetic fluid used in the application enhance the sensitivity of the pulse eddy current detection and the amplitude of the electromagnetic ultrasonic detection signal by enhancing the induced eddy current density and the bias magnetic field strength on the surface of the pipeline; on the other hand, the detection signal-to-noise ratio of the probe is improved by reducing the shear wave noise in the permanent magnet; meanwhile, the purpose and effect of synchronous detection of the inner and outer wall defects of the pipeline are achieved through a signal separation method.

Sealing arrangement for sealing a vacuum side (6) from an ambient side (7), with a ferrofluid seal (4) between a rotatable shaft (2) and a housing (3), characterized in that the sealing arrangement (1) between the ferrofluid seal (4) and the vacuum side (6) has a switchable additional seal (5) which can be switched between an out-of-service position without sealing function and a sealing position in which the shaft (2) is sealed to the vacuum side (6) via the additional seal (5).

The application discloses a four-drive magnetic source ferromagnetic fluid micro-pump with embedded fixed magnetic sources, and belongs to the technical field of micro-fluid transmission control. The micro-pump comprises a pump body provided with a circular pump cavity, ferromagnetic fluid accommodated in the pump cavity, and a magnetic source system composed of a fixed magnetic source and four rotatable driving magnetic sources. Two driving magnetic sources are arranged on two sides of the pump cavity in each group, and can synchronously rotate around the axis of the pump cavity. The fixed magnetic source and the driving magnetic sources form a five-magnetic-source coupling structure, and a uniform and efficient superimposed magnetic field is generated in the circular pump cavity, so that the ferromagnetic fluid is magnetized to form a stable 'driving disc'. The driving disc rotates with the driving magnetic sources and periodically changes the volume of the pump cavity, so that the fluid is directionally pumped from the liquid inlet to the liquid outlet. Through the multi-magnetic-source coupling and rotary driving design, the magnetic field force and uniformity are significantly enhanced, the driving force, the back pressure resistance, the operation stability and the rotating speed of the micro-pump are effectively improved, and the pollution risk of the magnetic fluid is reduced.

A physical random number generator based on the optical detection of magnetically induced fluid turbulence, comprising: a. a transparent container (10) with a volume of ferrofluid (12); b. an arrangement of at least two electromagnetic coils (20A, 20B) positioned such that they expose the ferrofluid (12) to fluctuating magnetic fields; c. a computer (70) configured to output independent, variable power signals (52A, 52B) to the electromagnet coils (20A, 20B) to induce chaotic 3D peak formations and turbulent structures (14) in the ferrofluid (12); d. an optical measuring system comprising a laser source (30) configured to emit a beam (32) through the transparent container (10) and a light sensor (40) configured to detect the fluctuations in the beam (34) caused by the turbulent structures (14); e. the method is characterized in that the computer (70) is further configured to receive an analog raw signal (42) from the light sensor (40) and digitizes and processes this signal to generate a final true random number (62) within a single hardware architecture.

The invention discloses a coreless axial flux motor with air gaps filled with ferrofluid and a design method thereof, the coreless axial flux motor with the air gaps filled with the ferrofluid comprises a stator with a stator winding and a rotor with permanent magnets, the air gaps are formed between the stator and the rotor, and the air gaps are filled with the ferrofluid; the design method comprises the steps of generating a current motor design scheme according to structure parameters of the coreless axial flux motor; establishing a motor model of the coreless axial flux motor according to the current motor design scheme, and calculating the power required by ferrofluid friction loss to be overcome by rotor rotation; and if the power does not meet the preset constraint condition, adjusting the structural parameters of the coreless axial flux motor, and repeating the steps until an optimal current motor design scheme is obtained. The invention aims to solve the problem of low air gap magnetic flux density of a traditional coreless axial magnetic flux motor and improve the heat dissipation performance of the coreless axial magnetic flux motor.

A device for generating a variable angular momentum for attitude control of a spacecraft includes a rotor and a stator on which the rotor is mounted and a means for driving the rotor via a rotating magnetic field. A bearing is formed by a fluid film of a ferrofluid between opposite bearing surfaces of the rotor and the stator. The fluid film is interrupted by one or more gas inclusions. The bearing preferably extends about the central axis over a region that has a smaller radius than the rotor. One or more permanent magnets are arranged on the rotor or on the stator in the region of the bearing, wherein the ferrofluid is held in a fixed position relative to the rotor or the stator and a magnetic pressure is generated in the ferrofluid by the one or more permanent magnets.

The present invention refers to a method for generating magnetic field patterns aimed in particular at analyzing specimens via nuclear magnetic resonance imaging (MRI), or magnetic induction imaging at the microscale, or inducing masking of a substrate via magnetic, magnetorheological, or ferrofluid lithography (101). The method comprises the step of generating a magnetic field pattern by using an array (103) with a plurality of current lines (1, 2; 1) that each are in the form of a meander. The invention further refers to a device comprising an array (103) with a plurality of current lines (1, 2; 1) that each are in the form of a meander.

A liquid cooling system includes a tube and a coolant liquid flow motor. The tube carries a liquid coolant. The liquid coolant includes ferromagnetic particles. The coolant liquid flow motor is provided around a perimeter of the tube, and induces a vortex in a flow of the liquid coolant.

The invention relates to the technical field of acceleration measurement, and particularly discloses an acceleration sensor based on a conductive magnetorheological elastomer, and the acceleration sensor comprises a housing which is provided with a sealed cavity, and the sealed cavity is filled with ferrofluid; the permanent magnet is arranged in the sealing cavity and connected with the inner wall of the shell through an elastic supporting piece so that the permanent magnet can be suspended in the ferrofluid; and the conductive magnetorheological elastomer is installed in the sealing cavity, the central axis of the conductive magnetorheological elastomer coincides with the central axis of the permanent magnet, and a first electrode and a second electrode are arranged on the two sides of the conductive magnetorheological elastomer respectively and connected with the positive electrode wiring terminal and the negative electrode wiring terminal respectively. The acceleration sensor is simple in structure, wide in frequency response range and complete in measurement information, and efficient conversion and measurement of acceleration signals are achieved through the magnetic response characteristic of the ferrofluid and the high-sensitivity sensing capacity of the conductive magnetorheological elastomer.

An electronically-controlled digital ferrofluidic device is disclosed which employs a network of individually addressable coils in conjunction with one or more movable permanent magnets, where each moveable permanent magnet delivers the designated fluid manipulation-based tasks. The underlying mechanism facilitating fluidic operations is realized by addressable electromagnetic actuation of miniaturized mobile magnets that exert localized magnetic body forces on droplets filled with magnetic nanoparticles. The reconfigurable, contactless, and non-interfering magnetic-field operation properties of the underlying actuation mechanism allow for the integration of passive and active components to implement advanced and diverse operations with high efficiency (e.g., droplet sorting, dispensing, generation, merging, mixing, filtering, and analysis).

The present disclosure provides variable geometry nozzle or valve assemblies utilizing magnetic fluid (e.g., ferromagnetic fluid; magnetorheological fluid; non-Newtonian magnetic fluid; general viscous magnetic fluid). More particularly, the present disclosure provides variable geometry nozzle or valve assemblies utilizing magnetic fluid for high efficiency expansion and / or mass flow control in fluidic systems (e.g., gas injectors; micro-satellite propulsion systems; gas burners; fluid injectors; etc.).